Current Mirror Circuits for Low Voltage Environments
A current mirror and low-voltage technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as difficult to use low power supply voltage, and achieve the effect of reducing the voltage drop of source and drain terminals and good performance
Active Publication Date: 2016-08-17
CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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Problems solved by technology
Therefore, current mirrors of existing structures (such as figure 2 shown) Difficult to use in low supply voltage environment
Method used
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[0021] The present invention will be further described below in conjunction with accompanying drawing:
[0022] see figure 1 , a current mirror circuit applied to low-voltage design, which is composed of three parts: a current mirror unit, a decompression drop circuit and a start-up circuit;
[0023] The current mirror unit includes a first transistor MP1 and a second transistor MP2; wherein, the gate of the first transistor MP1 is connected to the gate of the second transistor MP2, and the sources of the first transistor MP1 and the second transistor MP2 are connected to a power supply Voltage;
[0024] The decompression drop circuit includes a third transistor MP3, a fourth transistor MN1, a fifth transistor MN2 and a sixth transistor MN3; wherein, the gate and source of the third transistor MP3 are respectively connected to the gate and the source of the first transistor MP1 The source is connected; the drain and the gate of the fourth transistor MN1 are connected to the...
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Disclosed is a current mirror circuit suitable for a low voltage environment. The current mirror circuit aims at overcoming the defects of the existing current mirror circuit. The current mirror circuit which is of a new structure is formed by three portions of a current mirror unit, a voltage drop reduction circuit and a startup circuit unit; the current mirror unit comprises a first transistor MP1 and a second transistor MP2; the voltage drop reduction circuit comprises a third transistor MP3, a fourth transistor MN1, a fifth transistor MN2 and a sixth transistor MN3; the startup circuit unit comprises a seventh transistor MP4. According to the current mirror circuit suitable for the low voltage environment, the voltage drop of the source-drain end of every current mirror transistor can be reduced and accordingly the voltage drop which is large enough can be provided for a current generation module when the power supply voltage is low so as to enable the current generation module to normally work and accordingly the good performance is obtained.
Description
technical field [0001] The invention belongs to the field of analog CMOS integrated circuits, in particular to a current mirror circuit suitable for low-voltage environments. Background technique [0002] Moore's Law predicts that the number of transistors integrated on a chip will double every 18 months. This prediction has been confirmed by the development of the semiconductor industry in the past few decades and has also guided the development of the semiconductor industry. Competition drives the semiconductor industry to continuously develop more advanced manufacturing processes. The size of the transistors produced is getting smaller and smaller, the chip area occupied by the same number of transistors is reduced, and the cost is reduced. More advanced manufacturing technology is also conducive to improving chip integration and manufacturing integrated circuit products with better performance and stronger functions. Every time a semiconductor manufacturing process adva...
Claims
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IPC IPC(8): G05F3/26
Inventor 张森陈林林权磊付秀兰
Owner CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST